package com.heima.gateway.filter;

import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //    1. 获取请求响应对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //2. 放行登录请求
        if (request.getURI().getPath().contains("/login")) {
            return chain.filter(exchange);
        }
        //3. 获取请求头中的token
        String token = request.getHeaders().getFirst("token");
        //4. 判断token是否存在
        if (StringUtils.isBlank(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //5. 校验token是否有效
        Claims token1 = AppJwtUtil.getClaimsBody(token);
        int result = AppJwtUtil.verifyToken(token1);
        if (result == 1 || result == 2) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //获取用户id
        Long id = token1.get("id",Long.class);
        Long value = Long.valueOf(id);
        if (id == null || value == 0) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //将获取的id放到前期头当中
        ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders ->
                httpHeaders.add("userId", id + "")).build();
        //通过交换机放行出去
        ServerWebExchange build = exchange.mutate().request(serverHttpRequest).build();
        return chain.filter(build);
    }
    @Override
    public int getOrder() {
        return 0;
    }
}
